_Retrospective and Prospective Jealousy._—There are three kinds of modern Jealousy—Retrospective, Present, and Prospective. The rejected lover’s Jealousy is of the third kind; it refers not to what is, but to what will or may be. Another variety of Prospective Jealousy is illustrated by a story told in a Moscow journal of an old peasant who married a young girl of whom he was very jealous. On his deathbed he expressed a desire to give her a last kiss. But hardly had she touched him, when he seized her under lip and fastened his teeth so tightly in it that a knife had to be used to pry them open. With his dying breath he confessed that his object had been to mutilate her, so that no one else might marry her. Is it not possible that the custom of burning widows in India was at first an outcome of the Jealousy of some influential ruler who set the fashion? Present Jealousy does not call for any special remarks, but Retrospective Jealousy has some curious features. It is entirely non-existent not only among those savage tribes who scorn virgin brides, but among some semi-civilised peoples in Africa and Asia where the men prefer to marry women with a dowry, no matter how they may have earned it. In modern love Retrospective Jealousy is often very strong, especially in men who, though they do not hesitate to marry a girl who has been engaged before, would not care to dwell on the details of the previous engagement. Women, too, have been known to indulge in this futile form of Jealousy. Thus Heine relates in one of his letters that at the special request of his Mathilde, he got her a copy of the French edition of his _Pictures of Travel_. “But hardly had she read a few pages, when she turned deadly pale, trembled in all her limbs, and begged me for heaven’s sake to close the book. She had come upon a love-scene in it, and jealous as she is, she does not even want me to have adored another _before_ her _régime_; indeed, I had to promise her that in future I would not address any language of love even to the imaginary ideal personages in my books.” The trouble with Heine is that one never knows exactly when he is relating facts and when indulging in fun and fiction. As a rule, certainly women are not much troubled by Jealousy regarding the past. If the lover promises to be a good boy in future and give them a monopoly of his adoration, they are rarely disquieted by the question, “Has he been in love before?” Indeed, there is a current notion that women admire a man all the more for being a Don Juan or professional lady-killer. Perhaps, however, this is putting the cart before the horse: for, instead of admiring him because he is a lady-killer, is it not possible that he is a lady-killer because they all admire him?